Replace special earlySelect care by simply allowing async execution for surround, replace

[t9md]

Currently, surround and replace, replace-character(r) have supportEarlySelect = true.

This was introduced in #622 to give better UI feedback to user to make surround operation easy.

• Old: Select target earlily before calling execute().
• New: Read user input after calling execute() and target selected(require async execute).

Operator.prototype.execute() already allowed to return Promise since very long time ago(added to support TransformStringByExternalCommand).